So i recently bought the Nikon D3400 because i want to get into photography. The 18-55mm kitlens i got seems to be pretty decent, but not at any range.

I would like some suggestions for a lens under 500AUD, that is good for taking wildlife photography. Also, i have heard that using a full-frame lens won't be very sharp on a cropped sensor, so any suggestions for lenses that suit the cropped sensor on my camera would be much appreciated.

You heard wrong. Full frame lenses can be sharper on crop sensor cameras because the smaller sensor only uses the center of the lens's image circle, and the center portion is typically sharper.

Depending on the type of "Wildlife" anything from 300mm up. I use a 150mm-500mm lens for birds and wildlife and sometimes wish it were longer. 300mm is sufficient for larger animals at relatively close distances (think in a zoo) but typically not in the wild where they are shy.

Best advice I could ever give someone looking to get into wildlife photography is wait and save. I know it's not what you want to hear but it's true. Follow below.

Option A. Buy a cheaper lens now that isn't quite up to the task, to short and quality just isn't quite there. Sure you can upgrade later but only top glass holds it's value. You'll take a hit on the resale.

Option B. Wait and save a little more. The difference between a 70-300 and say a Tamron 150-600 G2 is worth the price. In the interim, join a photo club. You may be able to borrow/rent longer lenses when you need to.

I meet people weekly that ask why they can't get that crisp sharp image. Most of the time they have the skill but they are pushing their lens beyond it's limits. The 70-300 is a decent lens but do know it's limits and try not to expect to shoot small birds at any distance.

The second piece of advice has been covered but it's buy used if at all possible. It can save you thousands of dollars.

Ok thank-you for clearing that up. I don't have a lot of money, so do you think a 70-300mm lens would be a good start? And is there any particular lens under 400usd that would work for me?

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I have the 70-300 and it is a good lens. My only complaint with it is that the autofocus is somewhat slow. It will work fine for relatively close "Wildlife", depending on your definition of "Wildlife". For normal sized birds you will need to be close, say 3 to 4 meters max.

The shot of a Cocatoo below was taken with my 70-300 at 116mm and a focus distance of 3.16 meters.

This shot of an Eurasian Lynx was also taken with my 70-300 at 230mm focal length and 5.6 meters focus distance

And this Red Kangaroo was taken at 116mm focal length and 6.5 meters focus distance

Not the greatest photos but I was trying to find something similar to what I guess you would find there. All of these were taken at the Nashville Zoo so I was close to the animals.